Nodoka is getting suspicious of Ranko, Ryoga placed her into a polar bear costume and Azusa kidnapped her, making her escape she is forced into a cute dress. During a fight with Ryoga Ranma’s grandparents witness Ranma’s curse. They are horrified to see their granddaughter fighting when she passes out they take her to the Tendo’s where they tell Nodoka she is her son. Nodoka is forced to sign a contract to stop Ranma fighting in female form and exploiting her assets. Ranma is given three ultimatums and must choose one before a year, one of which is staying in girl form for a year. After a fight that destroyed the Tendo’s house Ranma is forced to choose and she needs new clothes for her long stay as a girl as they move in with her grandparents. (Ranma/Herb pairing, will update description when I read this again sometime.)